package cn.wl.gulimall.seckill.service.impl;

import cn.wl.common.to.mq.SeckillOrderTo;
import cn.wl.common.utils.R;
import cn.wl.common.vo.MemberEntity;
import cn.wl.gulimall.seckill.feign.CouponFeignService;
import cn.wl.gulimall.seckill.feign.ProductFeignService;
import cn.wl.gulimall.seckill.interceptor.LoginUserInterceptor;
import cn.wl.gulimall.seckill.service.SeckillService;
import cn.wl.gulimall.seckill.to.SeckillSkuRedisTo;
import cn.wl.gulimall.seckill.vo.SeckillSessionsWithSkus;
import cn.wl.gulimall.seckill.vo.SeckillSkuVo;
import cn.wl.gulimall.seckill.vo.SkuInfoVo;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import org.apache.commons.lang.StringUtils;
import org.redisson.api.RSemaphore;
import org.redisson.api.RedissonClient;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

@Service
public class SeckillServiceImpl implements SeckillService {
    @Autowired
    CouponFeignService couponFeignService;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    StringRedisTemplate redisTemplate;
    @Autowired
    RedissonClient redissonClient;
    @Autowired
    RabbitTemplate rabbitTemplate;
    private final String SESSIONS_CACHE_PREFIX="seckill:sessions:";
    private final String SKUKILL_CACHE_PREFIX="seckill:skus:";
    private final String SKU_STOCK_SEMAPHORE="seckill:stock:";//商品随机码
    @Override
    public void uploadSeckillSKuLatest3Days() {
        //1.去数据库扫描最近三天参与秒杀的活动
        R r = couponFeignService.getLates3DaySession();
        if(r.getCode()==0){
            //上架商品
            List<SeckillSessionsWithSkus> sessionData = r.getData(new TypeReference<List<SeckillSessionsWithSkus>>() {
            });
            //缓存到redis
            //1.缓存活动信息
            saveSessionInfos(sessionData);
            //2.缓存活动的关联商品信息
            saveSessionSkuInfos(sessionData);
        }
    }

    @Override
    public List<SeckillSkuRedisTo> getCurrentSeckillSkus() {
        //1.确定当前时间属于哪个秒杀场次。
        long time = new Date().getTime();
        Set<String> keys = redisTemplate.keys(SESSIONS_CACHE_PREFIX + "*");
        for (String key : keys) {
            String replace = key.replace(SESSIONS_CACHE_PREFIX, "");
            String[] s = replace.split("_");
            Long start = Long.parseLong(s[0]);
            Long end = Long.parseLong(s[1]);
            if(time>=start && time<=end){
                //2.获取这个秒杀场次需要的所有商品信息
                List<String> range = redisTemplate.opsForList().range(key, -100, 100);
                BoundHashOperations<String, String, String> hashOps = redisTemplate.boundHashOps(SKUKILL_CACHE_PREFIX);
                List<String> list = hashOps.multiGet(range);
                if(list!=null){
                    List<SeckillSkuRedisTo> collect = list.stream().map(item -> {
                        SeckillSkuRedisTo redis = JSON.parseObject((String) item, SeckillSkuRedisTo.class);
//                        redis.setRandomCode(null);当前秒杀开始就需要随机码
                        return redis;
                    }).collect(Collectors.toList());
                    return collect;
                }
                break;
            }
        }

        return null;
    }

    @Override
    public SeckillSkuRedisTo getSkuSeckillInfo(Long skuId) {
        //1.找到所有需要参与秒杀的商品的Key
        BoundHashOperations<String, String, String> hashOps = redisTemplate.boundHashOps(SKUKILL_CACHE_PREFIX);
        Set<String> keys = hashOps.keys();
        if(keys!=null&&keys.size()>0){
            String reg = "\\d_"+skuId;
            for (String key : keys) {
                if(Pattern.matches(reg,key)){
                    String s = hashOps.get(key);
                    SeckillSkuRedisTo redisTo = JSON.parseObject(s, SeckillSkuRedisTo.class);
                    //随机码
                    long time = new Date().getTime();
                    Long startTime = redisTo.getStartTime();
                    if(time>=startTime&&time<=redisTo.getEndTime()){
                    }else{
                        redisTo.setRandomCode(null);
                    }
                    return redisTo;
                }
            }
        }
        return null;
    }

    @Override
    public String kill(String killId, String key, Integer num) {
        MemberEntity memberEntity = LoginUserInterceptor.loginUser.get();
        //1.获取当前秒杀商品的详细信息
        BoundHashOperations<String, String, String> hashOps = redisTemplate.boundHashOps(SKUKILL_CACHE_PREFIX);
        String str = hashOps.get(killId);
        if(StringUtils.isEmpty(str)){
            return null;
        }else{
            SeckillSkuRedisTo redisTo = JSON.parseObject(str, SeckillSkuRedisTo.class);
            //校验合法性
            Long startTime = redisTo.getStartTime();
            Long endTime = redisTo.getEndTime();
            long time = new Date().getTime();
            Long ttl = endTime-time;
            //1.校验时间的合法性
            if(time>=startTime&&time<=endTime){
                //2.校验随机码和商品id
                String randomCode = redisTo.getRandomCode();
                String skuId = redisTo.getPromotionSessionId()+"_"+redisTo.getSkuId();
                if(randomCode.equals(key)&&killId.equals(skuId)){
                    //3.验证购物数量是否合理
                    if(num<=redisTo.getSeckillLimit().intValue()){
                        //4.验证这个人是否已经购买过了.幂等性;如果只要秒杀成功，就去redis占位 userId_sessionId_skuId_
                        String redisKey =memberEntity.getId()+"_"+skuId;
                        //自动过期
                        Boolean aBoolean = redisTemplate.opsForValue().setIfAbsent(redisKey, num.toString(), ttl, TimeUnit.MILLISECONDS);
                        if(aBoolean){
                            //占位成功说明从来没有买过
                            RSemaphore semaphore = redissonClient.getSemaphore(SKU_STOCK_SEMAPHORE + randomCode);
                                boolean b = semaphore.tryAcquire(num);
                                if(b){

                                    //秒杀成功
                                    //快速下单.发送MQ消息
                                    String timeId = IdWorker.getTimeId();
                                    SeckillOrderTo orderTo = new SeckillOrderTo();
                                    orderTo.setOrderSn(timeId);
                                    orderTo.setMemberId(memberEntity.getId());
                                    orderTo.setNum(num);
                                    orderTo.setPromotionSessionId(redisTo.getPromotionSessionId());
                                    orderTo.setSkuId(redisTo.getSkuId());
                                    orderTo.setSeckillPrice(redisTo.getSeckillPrice());
                                    rabbitTemplate.convertAndSend("order-event-exchange","order.seckill.order",orderTo);
                                    return timeId;
                                }
                                return null;
                        }else{
                            //说明已经买过了
                            return null;
                        }


                    }
                }else{
                    return null;
                }
            }else{
                return null;
            }
        }

        return null;
    }

    private void saveSessionInfos(List<SeckillSessionsWithSkus> sessions){
        sessions.stream().forEach(session->{
            Long startTime = session.getStartTime().getTime();
            System.out.println("结束时间===》》"+session.getEndTime());
            Long endTime = session.getEndTime().getTime();
            String key = SESSIONS_CACHE_PREFIX+startTime+"_"+endTime;
             //缓存活动信息
            Boolean hasKey = redisTemplate.hasKey(key);
            if(!hasKey){
                List<String> collect = session.getRelationSkus().stream().map(item -> item.getPromotionSessionId()+"_"+item.getSkuId().toString()).collect(Collectors.toList());
                redisTemplate.opsForList().leftPushAll(key,collect);
            }
        });
    }
    private void saveSessionSkuInfos(List<SeckillSessionsWithSkus> sessions){
            sessions.stream().forEach(session->{
                //准备hash操作
                BoundHashOperations<String, Object, Object> ops = redisTemplate.boundHashOps(SKUKILL_CACHE_PREFIX);
                session.getRelationSkus().stream().forEach(seckillSkuVo -> {
                    String token = UUID.randomUUID().toString().replace("-", "");
                    if(!ops.hasKey(seckillSkuVo.getPromotionSessionId().toString()+"_"+seckillSkuVo.getSkuId().toString())){
                        //缓存商品
                        SeckillSkuRedisTo redisTo = new SeckillSkuRedisTo();
                        //1.sku的基本数据
                        R skuInfo = productFeignService.getSkuInfo(seckillSkuVo.getSkuId());
                        if(skuInfo.getCode()==0){
                            SkuInfoVo info = skuInfo.getData("skuInfo", new TypeReference<SkuInfoVo>() {
                            });
                            redisTo.setSkuInfoVo(info);
                        }
                        //2.sku的秒杀信息
                        BeanUtils.copyProperties(seckillSkuVo,redisTo);
                        //3.设置上当前商品的秒杀时间信息
                        redisTo.setStartTime(session.getStartTime().getTime());
                        redisTo.setEndTime(session.getEndTime().getTime());
                        //4.设置随机码
                         redisTo.setRandomCode(token);
                        String jsonString = JSON.toJSONString(redisTo);
//                    String s = JSON.toJSONString(seckillSkuVo);
                        ops.put(seckillSkuVo.getPromotionSessionId().toString()+"_"+seckillSkuVo.getSkuId().toString(),jsonString);
                        //5.使用库存作为分布式的信号量 限流
                        RSemaphore semaphore = redissonClient.getSemaphore(SKU_STOCK_SEMAPHORE + token);
                        //商品可以秒杀的数量作为信号量
                        semaphore.trySetPermits(seckillSkuVo.getSeckillCount());
                    }
                });
            });
    }
}
